颅内特殊部位胆脂瘤的MRI表现  

MRI Features of Intracranial Cholesteatoma in Special Regions

作　　者：全世杰[1] 董光[1] 王现亮[1] 王永奇[1] 于秀荣[1] 于建民[1] 周福良[1] 

机构地区：[1]山东省潍坊市人民医院放射科,山东潍坊261041

出　　处：《实用放射学杂志》2008年第12期1595-1596,1639,共3页Journal of Practical Radiology

摘　　要：目的探讨颅内非蛛网膜下腔胆脂瘤的MRI表现特点。方法分析经手术病理证实的6例非蛛网膜下腔胆脂瘤的影像学表现,其中3例位于脑实质内,2例位于脑室内,1例发生于硬脑膜。结果3例脑实质内胆脂瘤,2例呈长T1长T2信号为主的混杂信号,1例呈均匀长T1长T2信号,FLAIR图像均呈混杂信号,增强扫描,1例边缘区域局部轻度强化。2例三脑室内胆脂瘤不同程度向侧脑室及第四脑室蔓延,形态不规则,呈长T1长T2混杂信号,增强扫描无强化。1例硬脑膜胆脂瘤位于右侧额顶区,呈短T1长T2信号,增强扫描无强化。结论非蛛网膜下腔胆脂瘤具有一定的特征性,MRI可能做出正确的定性诊断。Objective To study the MRI features of intracranial non - subarachnoid cholesteatoma. Methods MRI features of intracranial cholesteatomas proved pathologically were analysed. Of them ,3 were intracerebral cholesteatomas,2 were in ventricle, and one was at dural cholesteatoma. Results In 3 cases with intracerebral cholesteatomas,two cases appeared as heterogeneous long T1 and long T2 signal intensity and one case appeared as homogeneous long T1 and long T2 signal intensity, and all showed heterogeneous signal intensity on FLAIR sequence. After contrast - enhancement with Gd - DTPA, one was slightly enhanced at margin. Two lesions in ventricle were heterogeneous long T1 and long T2 signal intensity and not enhanced after contrast - enhancement, the lesions were mainly in the third ventricle and grew into the lateral ventricle and the fourth ventricle. One lesion at dura in the right frontal - parietal region was short T1 and long T2 signal intensity,and not enhanced after administration of contrast medium. Conclusion Cholesteatomas localized at non - suharachnoid are also of obvious MRI characteristics,which can be diagnosed by MR imaging correctly.

关 键 词：脑 颅内 肿瘤 脂肪瘤 磁共振成像 

分 类 号：R739.41[医药卫生—肿瘤] R445.2[医药卫生—临床医学]